[Dovecot] Avoiding Hardlinks (was: Something other than dotlock for uidlist locking?)
me at benschumacher.com
Thu Aug 10 01:29:10 EEST 2006
On 8/9/06, James Berry <james at jberry.us> wrote:
> Hmm looks to me like rename() would give the same level of atomicity
> as link?
> So instead of doing link/unlink, we could just do rename()?
This is not entirely true. The point of the link/unlink pairing is to
ensure that the target file doesn't exist. There exists a race
condition that the link/unlink pairing will protect against: link will
not overwrite an existing file, rename will. The work around would be
to do something hackish along the lines of creating a dotfile for the
target of the rename before doing the actual rename... it's ugly, but
I think it's probably the safest cross networked filesystems way of
ensuring that the target file isn't being written at exactly the same
time you're trying to do your rename.
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